United States Department of Transportation
i
Cone penetrometer equipped with piezoelectric sensors for measurement of soil stiffness in highway pavement.
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2005-11-01
[PDF-5.66 MB]
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Abstract:The stiffness (elastic modulus and shear modulus) and Poisson's ratio of the base and sublayers are important parameters in the design and quality assurance during construction of highway pavements. The new highway construction guide proposed by AASHTO (American Association for State Highway and Transportation Officials) recommends such measurements be conducted. A new field-testing technique has been developed to measure the stiffness and Poisson's ratio of soils using cone penetrometers equipped with piezoelectric sensors. The device using this technique includes a pair of cone penetrometers, each fitted with two piezoelectric sensors, which can be pushed into foundation soils. One set of the sensors is used as wave transmitters while the other set as wave receivers. An electrical pulse produced by a function generator is used to activate the transmitters. Vibration of the transmitters produces primary and shear waves that propagate through the soil and are captured by the receivers. Then from the measured velocities of shear and primary waves, soil stiffness and Poisson's ratio can be determined. The technique has been proven to produce reliable results in the laboratory.
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